Replace 8.5.521 here with your current version of dotConnect for Oracle. Please note that the revision number of provider in the entityFramework section is *.6 but it should be *.0 in DbProviderFactories.

Try changing the "Metadata Artifact Processing" model property value from "Embed In Output Assembly" to "Copy To Output Directory". Save the model, rebuild the project on Windows to make sure it works, and deploy on Mono.